// 解决小数精度丢失

function toRound(value, n) {
	if(n === 'null' || n === 'undefined' || n === 0) return parseInt(value);
	let tran = Math.round(value * Math.pow(10, n)) / Math.pow(10, n);
	return tran
}

// 除法
function accDiv(arg1, arg2) {
	var t1 = 0, t2 = 0, r1, r2;
	try {
		t1 = arg1.toString().split(".")[1].length
		} catch (e) {
	}
	try {
		t2 = arg2.toString().split(".")[1].length
		} catch (e) {
	}

	r1 = Number(arg1.toString().replace(".", ""))
	r2 = Number(arg2.toString().replace(".", ""))
	return accMul((r1 / r2), Math.pow(10, t2 - t1));

}

//乘法
function accMul(arg1, arg2) {
	var m = 0, s1 = arg1.toString(), s2 = arg2.toString();
	try {
		m += s1.split(".")[1].length
	} catch (e) {
	}
	try {
		m += s2.split(".")[1].length
	} catch (e) {
	}
	return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)
}

//加法
function accAdd(arg1, arg2) {
	var r1, r2, m;
	try {
		r1 = arg1.toString().split(".")[1].length
	} catch (e) {
		r1 = 0
	}
	try {
		r2 = arg2.toString().split(".")[1].length
	} catch (e) {
		r2 = 0
	}
	m = Math.pow(10, Math.max(r1, r2))
	return (arg1 * m + arg2 * m) / m
}

//减法
function accSub(arg1, arg2) {
	var r1, r2, m, n;
	try {
		r1 = arg1.toString().split(".")[1].length
	} catch (e) {
		r1 = 0
	}
	try {
		r2 = arg2.toString().split(".")[1].length
	} catch (e) {
		r2 = 0
	}
	m = Math.pow(10, Math.max(r1, r2));
	n = (r1 >= r2) ? r1 : r2;
	return toRound(((arg1 * m - arg2 * m) / m), n);
}

export {
	accDiv,
	accMul,
	accAdd,
	accSub,
}
